Code - Jumbler

// A program that takes integers as command
// line arguments, jumbles them a little
// then types them back out

// Marc Chee (marc.chee@unsw.edu.au), July 2019

#include <stdio.h>
#include <stdlib.h>

#define MAX_NUMS 10

void read_args(int nums[MAX_NUMS], char *arguments[], int argCount);
void print_nums(int nums[MAX_NUMS], int numCount);
void swap_nums(int *num1, int *num2);
void jumble(int nums[MAX_NUMS], int numCount);

int main(int argc, char *argv[]) {
    int numbers[MAX_NUMS];
    read_args(numbers, argv, argc);
    jumble(numbers, argc - 1);
    print_nums(numbers, argc - 1);
    return 0;
}

// Read the command line arguments, ignoring the program name
// and convert them into integers, placing them in the array nums
void read_args(int nums[MAX_NUMS], char *arguments[], int argCount) {
    int i = 0;
    while (i < MAX_NUMS && i < argCount - 1) {
        nums[i] = strtol(arguments[i + 1], NULL, 10);
        i++;
    }
}

// print out a list of numbers to standard output
void print_nums(int nums[MAX_NUMS], int numCount) {
    int i = 0;
    while (i < MAX_NUMS && i < numCount) {
        printf("%d ", nums[i]);
        i++;
    }
}

void swap_nums(int *num1, int *num2) {
    int temp = *num1;
    *num1 = *num2;
    *num2 = temp;
}

void jumble(int nums[MAX_NUMS], int numCount) {
    int i = 0;
    while (i < MAX_NUMS && i < numCount) {
        int j = i * 2;
        if (j < MAX_NUMS && j < numCount) {
            swap_nums(&nums[i], &nums[j]);
        }
        i++;
    }
}